20 years.
The wind turbine blade is a thin shell structure made of composite materials. The structure is divided into three parts: root, shell and keel. There are many types, including pointed head, flat head, hook head, tip with flaps, etc. The manufacturing process mainly includes male mold, turning over female mold, lamination, heating and curing, demoulding, surface grinding, spray painting, etc. Design difficulties include aerodynamic design of the blade shape, strength, fatigue, noise design, and composite material layup design. The technical difficulties mainly include positive mold processing, mold remaking, and resin system selection. The blade is a large composite material structure, and more than 90% of its weight is composed of composite materials. Each generator generally has three blades, and each generator requires as much as four tons of composite materials.
Maintenance of blades. Cracks on the surface of the blades will generally appear after the wind turbine has been running for 2-3 years. Cracks are caused by low temperature and natural vibration of the unit. If the crack appears 8-15 meters away from the root of the blade, the crack will deepen and lengthen every time the wind turbine vibrates or stops. While the cracks are expanding, dirt and wind and sand in the air enter, causing the cracks to deepen and widen. Cracks seriously threaten the safety of the blades and can cause the blades to crack, and transverse cracks can cause the blades to break. If transverse cracks occur, zipper reinforcement and restoration must be used. Zipper reinforcement and restoration means using special tie bars to bond and repair the blade back to its original plane.
Can wind power fan blades be transported overtaking
Fan principle, however, in order to have a certain strength, the closer to the root of the fan blade, the thicker it becomes. Made of fiberglass. The reinforcing ribs made of fiberglass are placed in the mold and then injected with resin to form. The small air leaf has a solid structure, and the large one has a hollow structure. The hollow part of the large fan blade is almost half a cylinder. It is not an exaggeration to say that it is based on the principle of an airfoil. The installation angle of the fan blades is generally adjustable. The wind turbine has a complete constant speed device, and a device that automatically brakes, then turns, and finally rotates again when the wind direction changes. Don't do your own research and development. If you want to make a finished product for sale, just buy one and then reverse engineer it. You can search for "Manufacturing Process of FRP Fan Blades".
How to transport wind turbine blades
When transporting wind turbine blades, due to their large size and heavy weight, overtaking is not possible. Unless you are transporting very small wind turbine blades or special vehicles, overtaking is generally not possible.
In addition, during transportation, wind power blades also need to be carefully packaged and fixed to prevent damage caused by collisions between the blades. If there is vibration or overloading during transportation, it is easy to cause damage to the blades and even affect the power generation efficiency. Therefore, the transportation of wind power blades should be carried out safely and efficiently through professional vehicles and advanced logistics companies.
For the transportation of wind turbine fan blades, the requirements for the logistics company are extremely strict! First, we need to understand the wind turbine blades, which means that the basic data of wind turbine blades must be mastered. In addition, you need to know the starting point and end point of this transportation. Because the route needs to be designed, understood and on-site route surveyed, because some toll stations have width and height restrictions. Therefore, various plans must be made in advance, including emergency plans. If you want to know more details, there is a logistics company I recommend here. They are relatively experienced in engineering logistics, that is, large-scale transportation. Their name is Shanghai Shenghua Logistics Co., Ltd. You can find it on Baidu.